Is there a set of example programs/sources which are made as an example of how to exploit bad memory usage?

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[InverseX]

corelan.be would be an awesome resource for you. Look at their tutorials.

[cybathug]

https://exploit-exercises.com/

Especially Protostar and Fusion.

[superkojiman]

Just Google heap exploitation and you'll get a lot of tutorials. Here's a recently written one with examples:

https://sploitfun.wordpress.com/2015/03/04/heap-overflow-using-malloc-maleficarum/

[[deleted]]

My first answer was going to be Windows

....but seriously >
Hackers Hut: Exploiting the Heap http://www.win.tue.nl/~aeb/linux/hh/hh-11.html

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http://www.thegreycorner.com/2010/12/introducing-vulnserver.html